Implement animation root motion deltas (#84)

Implements root motion and adds a dash attack.

Reviewed-on: #84
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/scripting/move_compiler.rs

@@ -17,6 +17,7 @@ struct MoveCompiler {
     iasa_frame: Option<u32>,
     landing_duration: Option<u32>,
     cursor: u32,
+    use_root_motion: bool,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -114,6 +115,10 @@ impl MoveCompiler {
         self.iasa_frame = Some(iasa_frame);
     }
 
+    fn enable_root_motion(&mut self) {
+        self.use_root_motion = true;
+    }
+
     fn into_attack_script(mut self) -> Result<FighterAttackScript, String> {
         self.remove_all_hitboxes().map_err(|err| err.to_string())?;
         let mut hitboxes = self.hitboxes;
@@ -124,6 +129,7 @@ impl MoveCompiler {
             iasa_frame: self.iasa_frame,
             wont_autocancel_window: self.wont_autocancel_window,
             landing_duration: self.landing_duration,
+            use_root_motion: self.use_root_motion,
         })
     }
 }
@@ -232,6 +238,18 @@ pub fn compile_script(text: &str) -> Result<FighterAttackScript, String> {
             );
         }
 
+        {
+            let mc = mc.clone();
+            engine.register_fn(
+                "enable_root_motion",
+                move || -> Result<(), Box<EvalAltResult>> {
+                    let mut b = mc.borrow_mut();
+                    b.enable_root_motion();
+                    Ok(())
+                },
+            );
+        }
+
         {
             let mc = mc.clone();
             engine.register_fn(